diff --git a/lib/day1.ex b/lib/day1.ex
index 1122ecc..529a814 100644
--- a/lib/day1.ex
+++ b/lib/day1.ex
@@ -25,7 +25,8 @@ defmodule AocKata.Day1 do
   """
   @spec resulting_frequency(Enumerable.t()) :: integer
   def resulting_frequency(frequency_changes) do
-    # TODO implement
+    frequency_changes
+    |> Enum.reduce(0, &(String.to_integer(&1) + &2))
   end
 
   @doc """
@@ -55,8 +56,16 @@ defmodule AocKata.Day1 do
   """
   @spec resulting_frequency_fixed(Enumerable.t()) :: integer
   def resulting_frequency_fixed(frequency_changes) do
-    frequency_changes = Stream.repeatedly(fn -> frequency_changes end) |> Stream.flat_map(& &1)
+    frequency_changes
+    |> Stream.cycle()
+    |> Enum.reduce_while({0, %{0 => true}}, fn change, {frequency, reached_frequencies} ->
+      frequency = frequency + String.to_integer(change)
 
-    # TODO
+      if reached_frequencies[frequency] do
+        {:halt, frequency}
+      else
+        {:cont, {frequency, Map.put(reached_frequencies, frequency, true)}}
+      end
+    end)
   end
 end